Device for bending tubing.



PATENTED MAY 1, 1906.

W. J. HERE.

DEVICE FOR BBNDING TUBING APPLICATION FILED SEPT. 30, 1905.

mmwtoz scribed an and, secondly,

nnrrsn STATES PATENT orrron.

WILLIAM J. sass, or esANn RAPIDS, MICHIGAN, Assienos TO 0. eQ V CONN COMPANY, or ELKHART, INDIANA.

DEVICE FOR BENDBNG ruisme.

. Specification of Letters Patent;

Patented May -1, 1908.

Application filed September 1906 Serial l-lo; 280,791.

This invention relates to a new and useful machine for, bending tubing, and is especially sica instruments, but may be used wherever it is desirable to quickly bend a metal tiibe, so as to prevent any imperfections in the finished product.

The invention consistsof the combination and arran ement of parts hereinafter declaimed.

The objects of the invention are, first, to furnish.a machine puickly and readily bent into any required iorm without crimping or'wrinkling the tube,

to cheapen the work of bendmg metal and other tubes These'objects I accomplish by means of the mechanism illustrated in the accompanying drawings, in which, p

Figure l is a side elevation of a machine constructed in accordance with my invention, showing a section of tubing partially bent by the machine. Fig. 2 is a front elevation of the machine, showing how the tube is held between the stationary die and the movable die. Fig. 3 is an inverted plan view of the die illustrated in Fig. 1, showing one means of securing the tube to the stationary die and also showing the standard in section. Similar numerals refer to similar parts throughout the several vibws.

In the example of my invention shown in the drawings I have mounted the stationary die; upon a standard. It will be evident, however, that it may be mounted in any suitable manner.

1 shows the main bed-plate supporting-the standard 2. The standard 2 supports the die 3. This die 3 is preferably stationary and supported, so that it will operation of bending the tube.

3 is a curved groove in the stationary die, made of sufficient size to receive a portlon of the-tube to be operated upon.

4.4 are What might be termedlinks, one

Michigan, have invented new and adapted for the bending of tubes used in mu whereby a tube may be 4, so as to cause the rotary secured therein and rotary 'forming die out of the Way,

not be moved in the l end of the links being secured by the bolts 6 to a lever, which lever is provided with a hendle or holder 9, the holder for the rotary'forming-die being'shown by 7.

8 represents the rotary forming-die, which I is pivoted to the links The rotary formin -die is an annular groove. gShown by means of the bolts rovided with y 8) This "groove is adapted to fit upon the tube to be ent, and what I term the rotary formingtlie is moved by means of the lever, so as to travel along the outer curve of the'tube as-the sameis operated upon. The groove in the stationary die and the roove in the rotary forming-die are intende substantially to-encircle thetube to be ben cumferenoe thereof.

throughout the cirp v w 10 represents a section of tubingand .isj shown partially bent in Fig. 1.

11 is a link-holder -for securing the tube to the stationary die. This is done, by means of the thumb-screw 12, E s. 1 and 3.

nasmuch as tubes difier somewhat in thickness,

means for as shown in forming-die to press evenly upon the tube to be bent. Any

suitable means may be used for this purpose,

but I have-used eccentrics or cams, (shown by 13 and 14,) which eccentrics or cams are held in position by the bolts 5 and 6, or said cams may be a portion of'said'bolts, if desired. In somecBsesFone of said cams might be dispensed with and sufficient adjustment might be obtained by;a"single cam. In case tubes hit Ye a uniformity of'thi'ckness and size the cam adjustment is notrequired.

In using this invention the piece of tube to be bent may be Iplaced in the groove 3 and y the link 11. When the nukes are in horizontal position, the lever having been lowered,= sol as to :carry' the links so as raisto allow for the insertion of the tube ing the handle 9, the rotaryforming-die 8 is pressed in contact with the tube l0, and by continuing to move the handle or lever the tube is compressed firmly between the two dies and is bent into the exact shape of the stationary die.

By this simple construction any'ordinary preferably, '75

I deem it advisable to provide adjusting the length of the links 4 the proper shape or to piece of tubing caigbe bent into any required the outer curved portion of ed to trav-ci on seir curved form Without crimping the inner curved portion and Without unduly straining the tube.

' Having thus described my invention, what I claim to have invented, end desire to secure by Letters Patent, is- I 1. In it machine of the class described, a bed-plate having a standard, a fixed die on. said standard and provided with a. groove in. one of its faces, the latter adapted to determine the bend of the tubing when operated upon, said groove in the fixed die encircling a portion of the tubing when in position. on the die, e lever, links for movably connecting the lever to the fixed die, a rotary forming-die provided with a groove encircling the remaining portion of the tubing and supported by seid lever, said rotary formingeie adeptstationary die when in operative position, and eccentrics carried by the said links for regulating the position of the dies with respect to one another.

2. A machine for bending tubes including a base-piste, a standard thereon, a, die carried at the free end of said standard and having an annular groove for encircling a portion of the tubing to be operated upon, said die adapted to determine the bend of the tube, a rotary forming-die having a groove for encir cling the remaining portion of: the tube, and adapted when in operative position to travel on the stationary die, a lever for said rotary die, links pivotelly connected with the lever and the fixed die iLt opposite sides thereof for movebly' supporting said holder, eccentrics carried by said links and in engagement with l the pivotal connections of the links to adjust l the dies for regulating the pressure thereof, 1 and a locking device carried by the fixed die l l l l l l l "for securing one end of the tubing in position on the same.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. VVILLiAiri J. HERB.

Witnesses EDWARD TAGGART, MARY S. Tooiinn. 

